基于提前换相法的无刷电机转矩波动控制

无刷直流电机具有输出转矩大，良好的静、动态调速性能等优点而广泛应用于工业自动化，汽车及航空航天等领域。但电磁转矩波动是无刷直流电机固有的特性之一，它一直制约着无刷直流电机在控制性能要求较高的应用领域的应用，针对无刷直流电机换相时引起的电磁转矩波动，分析其原因，并且提出提前导通换相的方法控制电磁转矩波动。该方法通过设置提前导通角，加快了换相相的电流上升速度，使得跟关闭相的电流衰减率相匹配，目的是使非换相相的电流幅度波动趋于零，从而达到抑制电机转矩波动的目的。最后通过Matlab建立仿真系统，证实了该方法的正确性及推广前景。

Suppression of Torque Ripple for Brushless DC Motor by Advance Phase Conversion

As the brushless direct current motor （BLDCM） has the advantages of large output torque, good static and dynamic performance of ＂speed adjustment, it＇s widely used in many fields such as industrial automation, automobile and aero- space, and so on, but the torque ripple, as an inherent quality for BLDCM, restricts the BLDCM application in the fields in which the higher control performance is needed. The reason that causes torque ripple in brushless DC motor during the com- mutation is analyzed. The method of the advance phase conversion is proposed, which sets the conduction angle in advance to make the current of the commutation phase rised rapidly, make the raised current of the commutation matched with the current attenuation ratio, and make the non-commutation phase current ripple amplitude tended to zero. The method is very useful in the torque ripple suppression. A simulation system was built with Matlab. The simulation result shows that the method is feasible and can be widely promoted.